What are the advantages of the headspace gas chromatograph analysis?

Headspace Gas Chromatography (HS-GC), also known as liquid gas injection gas chromatograph analysis, is to add a headspace sampler (in manual and automatic) in front of the gas chromatograph inlet. A chromatographic technique is often interpreted as an instrument that combines a headspace sampler with a gas chromatograph. It can collect the volatile components in the sample in a specific way. Compared with liquid-liquid extraction and solid phase extraction, it can avoid the loss of volatiles when solvent is removed, and reduce the noise caused by the co-extract. Sensitivity and analysis speed are less harmful to analysts and the environment, easy to operate, reproducible, and accurate injection volume. It is an analytical method that meets the requirements of “green analytical chemistry”.

In the previous headspace analysis, most of the volatile components in liquid (or solid) samples were determined by infrared spectroscopy, ultraviolet spectroscopy, mass spectrometry, and the like. Due to the limited sensitivity of these test methods and the lack of ability to separate the mixtures, it is difficult to obtain the desired analytical results when several components are present in the gas.

Since the advent of gas chromatography, many chromatographers have applied gas chromatography to headspace injection analysis. Gas chromatography has good separation efficiency, high sensitivity, low sample consumption, fast analysis, and wide application range. The characteristics of the headspace analysis show a new prospect.

Lu Chuang instrument chromatography engineers believe that the headspace gas chromatograph analysis has the following advantages over ordinary chromatographic analysis:

1. Widely applicable and wider

Headspace gas chromatograph analysis can analyze both volatile components in liquid samples and volatile materials in solid samples; it is suitable for both one-component volatile gas samples and complex compositions. The volatile component mixture is separated and analyzed; it can be used for both constant head air sample analysis and low content of volatile components.

2. Fast and easy, accurate injection

Headspace gas chromatography analysis directly takes a volatile gaseous sample of a liquid sample (or solid sample) and sends it to an air-phase chromatograph for separation and analysis. In many cases, the sample preparation operation can be omitted, and the human interference factor is small, so the method is faster and easier than ordinary chromatographic analysis. In addition, the analysis is more accurate due to the use of quantitative tube injection.

3. Low detection limit and good reproducibility

Headspace gas chromatography sometimes yields lower detection limits than conventional GC analysis because it avoids the solvent interference caused by conventional sample preparation and the specificity of the headspace sample. . For liquid or solid samples that are easily decomposed and cannot be directly injected for analysis, they have more practical value. Its pressure balance is automatically injected and reproducible.

Since the headspace GC analysis with its unique advantages, therefore, in the field of food analysis, environmental science, materials science, biological science, oil exploration, medical equipment and the like, it has been widely used.

The headspace gas chromatograph analysis method is in the ascendant stage. With the development of science and technology, it will be widely used in quantitative and qualitative analysis. Such as the detection of ethylene oxide residues in medical devices, the detection of volatile organic compounds in soil treatment, the determination of VOC in water, the determination of alcohol concentration in blood, the determination of volatile solvents in printed packaging, the determination of acetaldehyde in beverage (PE) bottles, and the uniqueness of Chinese herbal medicines. Flavor component determination and the like.

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